Need Your Help!!!!

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Hello, Does anyone own an xbox360? If so does anyone know how to connect a wireless controller to one, because i have got two and so does my brother, but one of his controllers does not work so he thought he would switch it with one of mine without my knowing but i found out, i have got the controller back from him but now when i want to use that controller it turns his on not mine, so does anyone know how i can make it work with mine? Would really appreciate your help guys Thanks